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If you want to lose weight, should you cut fat out of your diet, or keep it in? Are carbs your friend or your enemy?

NPR recently looked into the fat-free food fad of the 1990s and found that the fat-free cheese we were eating actually contributed to the nation's growing obesity crisis.

"In one paper, published by Swedish researchers in the Scandinavian Journal of Primary Health Care, middle-aged men who consumed high-fat milk, butter and cream were significantly less likely to become obese over a period of 12 years compared with men who never or rarely ate high-fat dairy," NPR reported. "Yep, that's right. The butter and whole-milk eaters did better at keeping the pounds off."

So what is a waistline-conscious person to do? We talk with two nutrition experts to get the skinny on what really makes us fat.